Form CT-1040ES, Connecticut Estimated Income Tax Payments are due on or before April 15, June 15, September 15, and January 15 for calendar year filers,. Fiscal year filers should follow federal filing dates. If the due date falls on a Saturday, Sunday, or legal holiday, the next business day is the due date. An estimate will be considered timely filed if received or if the date shown by the U.S. Postal Service cancellation mark is on or before the due date. To find the form or further instructions, click here.
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TSC - Simplified Paperless Filing for your Connecticut Withholding Tax, Sales and Use Taxes, Disaggregated Sales Tax Report, Business Entity Tax, Corporation Business Tax, Room Occupancy Tax, Attorney Occupational Tax, Admissions and Dues Tax, Trust and Estate, Composite Income Tax, and Nursing Home User Fee
The Nursing Home User Fee and the Disaggregated Sales Tax Report can only be filed through the TSC.